Ichnospecies: mcconelli MEHL, 1931
Etymology: In honor of N. H. McConnell, who donated the material to the University of Colorado Museum of Natural History at Boulder (CUM).

Holotype: UCM-17614

Locality: Clay pits 5 km north of Golden, Jefferson County, Colorado.

Horizon: South Platte Formation, Upper Part of the Dakota Group.

Biostratigraphy:

Age: Late Albian Stage, Middle Gallic subepoch, upper Early Cretaceous Epoch, Early Cretaceous-Early Cenomanian Stage, Upper Gallic Subepoch, Lowermost Gulf Epoch, Middle Cretaceous.

Material: Six consecutive footprints (Trackway one of Lockley, et al., 20009).

Paratype: UCM 98120: Four trackways (2-5, 7 and 10). All the trackways have longer steps and correspondingly greater pace anguliations than the type.

Paratype: UCM 98121: Four trackways (6-9). Trackwas 6 has three footpritns with short steps, and trackwasy 7 and 9 are based on single tracks. Trackway 8 has nine closely spaced, partially-overlapping tracks indicative of a “shuffling” gait. The steps indicate a very low pace angulation (64?). The shuffling gait is similar to extant herons, other waders, gulls and shorebirds (Meyerriecks, 1959, 1962, Willard, 1977) as a means to bring invertebrates to the surface of the substrate in shallow water.

Paratype: UCM 98122: At least six trackways (10-15). Only trackway 13 has several tracks, the other five are of a single track. Like trackway 8, it shows a “shuffling” gait.

Topotype: CU 203.28: Latex mold and replica of the track surface at site 1.At least 10 trackways are identifiable. The trackways were identified as G (Golden after the type locality) 1-G9. Trackways G1-G3 are from the small SW sector are poorly preserved, but trackways G4-G9 are well preserved with between 7 and 10 tracks each. Lockley et al., (2007) discovered more tracks/trackways at the type locality.

Topotype from Site 2 (Middle); about 40 additional tracks in 8 trackways (G10-G17).

Topotype from Site 2 (Middle): CU 203.35: G 18 is two incomplete tracks. The trackway indicates a lengthening and shortening in its steps while making a slight turn.

Topotype from Site 3 (Upper): Cu 203.1: has 60 and 70 complete and partial tracks in 7 trackways that are associated with at least 20 poorly-preserved dinosaur tracks and undertracks. Some of the bird tracks are obscured by dinosaur tracks, with the dinosaur tracks made after the bird tracks. .

Referred material:

Tracks from above the type horizon: the middle level, are poorly preserved natural casts of bird tracks, provisionally assigned to Ignotornis, are from a horizon ~90 cm above the lower “holotype’ track layer at Site 2. at least 10 tracks were identified (Cu 203.26 and 203.27 with other tracks in situ identifiable in the field.

Tracks from above the type horizon: the upper lever, are from level 2 m immediately above Site 3 and has approximately 30 moderately well-poorly-preserved tracks and are preserved as impressions, than casts (Lockley, et al., 2009).

FIORILLO, HASIOTIS, KOBAYASHI, BREITHAUPT & McCARTHY, 2011

Locality: Double Mountain, Denali National Park, Alaska.

Horizon: Cantwell Formation.

Biostratigrahy:

Age: Late Campanian, or Early Maastrichtian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material:

In situ: Aniosdactyl tracks.

Note: With feeding traces: Several dozen near-circular to suboval depressions.

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Species: yangi KIM, KIM, KIM, KIM & LOCKLEY, 2006
= Ignotornis yangi KIM, KIM, KIM, KIM, PARK, HAN & LOCKLEY, 2005 (nomen nudum)
Etymology: In honor of Seong-Young Yang, Kyungpook National University, Taegu, South Korea, for his contributions to vertebrate ichnology in Korea.

Holotype: KNUE 040417 (track number 66)

Locality: Changseon and Sinsu Islands, southern coast of South Korea.

Horizon: Haman Formation.

Biostratigraphy:

Age: Aptian-Albian Stage, Middle Gallic subepoch, upper Early Cretaceous Epoch, Early Cretaceous.

Material: Silcon rubber mold and plaster replica of 80 webbed tracks.